Minutes and Action List of August 5 2019 ArgonCube2x2 Instalaltion Meeting
- Attendance: John, Jim, Gary, Min Jeong, Sai, Steve and Ting
- On the detector configuration
- There are two needs to have extra space in between the downstream Minerva bookend and overhead bridge:
- Potential installation of a gas TPC prototype
- placement of a tall (12') rolling platform ladder to access top PMTs
- The UK prototype of gas TPC is about 2 meter tall with a gas tank cylinder vessel of OD 1.5m.
- McMaster Carr has a ladder (#8229T68) with foot printer of 16' tall (platform height of 12'6"), 54" width and 125" depth.
- For now, we decided to move detector upstream to leave 2m space between bookend and overhead bridge.
- Ting to get step file of the gas TPC vessel prototype from Jen so Gary to include it in his 3d model
- potential worry is the height limit to transfer the gas TPC vessel over Minerva module
- also worry about crane coverage at downstream end
- The addition of 5' section of rail for downstream Minerva module does not seem cause any problem for cryogenics piping routing and access
- we will keep it as the 10' total length for the rail unless we have other issues
- We also decided to extend the rail of upstream Minerva modules to 10'
- For accessing top PMTs on the downstream end, there are three possible solutions:
- (1)the tall platform ladder, (2) re-use of Minerva's movable platform, (3) and a short platform or stool on new 2x2 vessel platform
- Steve and Ting will arrange a meeting with Howard to go over the Minerva electronics installation experience and recommended a solution
- Sai collected sizing info of the Minos support beams and columns:
- beams have I-Beam of W18x35 with A36 4" square steel bars
- columns have W8x35
- For argonCube top access platform, we will use beam structures over the west and east catwalks to support the load of 4 persons+100lbs equipment
- the platform will be supported by the MINOS module support rails. We prefer not to use additional columns
- We will not put any crypgenic equipment or readout electronics on the platform. We will not need to worry about vibration impact on the experiment
- We can keep the platform light weight to allow some vibration when people steps on it. Need to check out the safety rules on this
- We postponed the decommissioning procedure discussion to next meeting
- Action task list:
- Gary to move the detector upstream to leave more room at downstream end and also extend the upstream Minerva module support rail length to 10'
- Ting to get step file of the gas TPC prototype
- Min Jeong to get more detailed cryogenic equipment layout and check out any conflicts or space clearance with support structure
- Steve and Ting to have meeting with Howard to finalize space and tooling requirement for Minerva module installation/service
- Sai to start to specify the beam sizing for the cryostat top access platform
- Next meeting is August 19, 2019
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